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-rw-r--r--libbuild2/variable.hxx3
1 files changed, 3 insertions, 0 deletions
diff --git a/libbuild2/variable.hxx b/libbuild2/variable.hxx
index a14c52b..e55a121 100644
--- a/libbuild2/variable.hxx
+++ b/libbuild2/variable.hxx
@@ -1380,6 +1380,9 @@ namespace build2
extern template struct LIBBUILD2_DECEXPORT
value_traits<vector<pair<string, optional<bool>>>>;
+ extern template struct LIBBUILD2_DECEXPORT
+ value_traits<vector<pair<optional<string>, bool>>>;
+
extern template struct LIBBUILD2_DECEXPORT value_traits<set<string>>;
extern template struct LIBBUILD2_DECEXPORT value_traits<set<json_value>>;